Fix typos in docstrings.
[bpt/emacs.git] / lisp / gnus / mm-util.el
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95fa1ff7 1;;; mm-util.el --- Utility functions for Mule and low level things
e84b4b86 2
2e62b574 3;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
114f9c96 4;; 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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5
6;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
7;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
8;; This file is part of GNU Emacs.
9
5e809f55 10;; GNU Emacs is free software: you can redistribute it and/or modify
c113de23 11;; it under the terms of the GNU General Public License as published by
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12;; the Free Software Foundation, either version 3 of the License, or
13;; (at your option) any later version.
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14
15;; GNU Emacs is distributed in the hope that it will be useful,
16;; but WITHOUT ANY WARRANTY; without even the implied warranty of
5e809f55 17;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18;; GNU General Public License for more details.
19
20;; You should have received a copy of the GNU General Public License
5e809f55 21;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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22
23;;; Commentary:
24
25;;; Code:
26
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27;; For Emacs < 22.2.
28(eval-and-compile
29 (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
30
23f87bed 31(eval-when-compile (require 'cl))
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32(require 'mail-prsvr)
33
f53b2875 34(eval-and-compile
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35 (if (featurep 'xemacs)
36 (unless (ignore-errors
37 (require 'timer-funcs))
38 (require 'timer))
39 (require 'timer)))
40
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41(defvar mm-mime-mule-charset-alist )
42
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43;; Emulate functions that are not available in every (X)Emacs version.
44;; The name of a function is prefixed with mm-, like `mm-char-int' for
45;; `char-int' that is a native XEmacs function, not available in Emacs.
46;; Gnus programs all should use mm- functions, not the original ones.
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47(eval-and-compile
48 (mapc
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49 (lambda (elem)
50 (let ((nfunc (intern (format "mm-%s" (car elem)))))
51 (if (fboundp (car elem))
52 (defalias nfunc (car elem))
53 (defalias nfunc (cdr elem)))))
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54 `(;; `coding-system-list' is not available in XEmacs 21.4 built
55 ;; without the `file-coding' feature.
56 (coding-system-list . ignore)
57 ;; `char-int' is an XEmacs function, not available in Emacs.
f53b2875 58 (char-int . identity)
e3e955fe 59 ;; `coding-system-equal' is an Emacs function, not available in XEmacs.
f53b2875 60 (coding-system-equal . equal)
e3e955fe 61 ;; `annotationp' is an XEmacs function, not available in Emacs.
f53b2875 62 (annotationp . ignore)
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63 ;; `set-buffer-file-coding-system' is not available in XEmacs 21.4
64 ;; built without the `file-coding' feature.
f53b2875 65 (set-buffer-file-coding-system . ignore)
e3e955fe 66 ;; `read-charset' is an Emacs function, not available in XEmacs.
f53b2875 67 (read-charset
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68 . ,(lambda (prompt)
69 "Return a charset."
70 (intern
71 (completing-read
72 prompt
73 (mapcar (lambda (e) (list (symbol-name (car e))))
74 mm-mime-mule-charset-alist)
75 nil t))))
e3e955fe 76 ;; `subst-char-in-string' is not available in XEmacs 21.4.
95fa1ff7 77 (subst-char-in-string
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78 . ,(lambda (from to string &optional inplace)
79 ;; stolen (and renamed) from nnheader.el
80 "Replace characters in STRING from FROM to TO.
91472578 81 Unless optional argument INPLACE is non-nil, return a new string."
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82 (let ((string (if inplace string (copy-sequence string)))
83 (len (length string))
84 (idx 0))
85 ;; Replace all occurrences of FROM with TO.
86 (while (< idx len)
87 (when (= (aref string idx) from)
88 (aset string idx to))
89 (setq idx (1+ idx)))
90 string)))
e3e955fe 91 ;; `replace-in-string' is an XEmacs function, not available in Emacs.
01c52d31 92 (replace-in-string
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93 . ,(lambda (string regexp rep &optional literal)
94 "See `replace-regexp-in-string', only the order of args differs."
95 (replace-regexp-in-string regexp rep string nil literal)))
e3e955fe 96 ;; `string-as-unibyte' is an Emacs function, not available in XEmacs.
f53b2875 97 (string-as-unibyte . identity)
e3e955fe 98 ;; `string-make-unibyte' is an Emacs function, not available in XEmacs.
23f87bed 99 (string-make-unibyte . identity)
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100 ;; string-as-multibyte often doesn't really do what you think it does.
101 ;; Example:
102 ;; (aref (string-as-multibyte "\201") 0) -> 129 (aka ?\201)
103 ;; (aref (string-as-multibyte "\300") 0) -> 192 (aka ?\300)
104 ;; (aref (string-as-multibyte "\300\201") 0) -> 192 (aka ?\300)
105 ;; (aref (string-as-multibyte "\300\201") 1) -> 129 (aka ?\201)
106 ;; but
107 ;; (aref (string-as-multibyte "\201\300") 0) -> 2240
108 ;; (aref (string-as-multibyte "\201\300") 1) -> <error>
109 ;; Better use string-to-multibyte or encode-coding-string.
110 ;; If you really need string-as-multibyte somewhere it's usually
111 ;; because you're using the internal emacs-mule representation (maybe
112 ;; because you're using string-as-unibyte somewhere), which is
113 ;; generally a problem in itself.
114 ;; Here is an approximate equivalence table to help think about it:
115 ;; (string-as-multibyte s) ~= (decode-coding-string s 'emacs-mule)
116 ;; (string-to-multibyte s) ~= (decode-coding-string s 'binary)
117 ;; (string-make-multibyte s) ~= (decode-coding-string s locale-coding-system)
e3e955fe 118 ;; `string-as-multibyte' is an Emacs function, not available in XEmacs.
95fa1ff7 119 (string-as-multibyte . identity)
e3e955fe 120 ;; `multibyte-string-p' is an Emacs function, not available in XEmacs.
56e09c09 121 (multibyte-string-p . ignore)
e3e955fe 122 ;; `insert-byte' is available only in Emacs 23.1 or greater.
56e09c09 123 (insert-byte . insert-char)
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124 ;; `multibyte-char-to-unibyte' is an Emacs function, not available
125 ;; in XEmacs.
01c52d31 126 (multibyte-char-to-unibyte . identity)
e3e955fe 127 ;; `set-buffer-multibyte' is an Emacs function, not available in XEmacs.
df06dd59 128 (set-buffer-multibyte . ignore)
e3e955fe 129 ;; `special-display-p' is an Emacs function, not available in XEmacs.
01c52d31 130 (special-display-p
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131 . ,(lambda (buffer-name)
132 "Returns non-nil if a buffer named BUFFER-NAME gets a special frame."
133 (and special-display-function
134 (or (and (member buffer-name special-display-buffer-names) t)
135 (cdr (assoc buffer-name special-display-buffer-names))
136 (catch 'return
137 (dolist (elem special-display-regexps)
138 (and (stringp elem)
139 (string-match elem buffer-name)
140 (throw 'return t))
141 (and (consp elem)
142 (stringp (car elem))
143 (string-match (car elem) buffer-name)
144 (throw 'return (cdr elem)))))))))
e3e955fe 145 ;; `substring-no-properties' is available only in Emacs 22.1 or greater.
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146 (substring-no-properties
147 . ,(lambda (string &optional from to)
148 "Return a substring of STRING, without text properties.
149It starts at index FROM and ending before TO.
150TO may be nil or omitted; then the substring runs to the end of STRING.
151If FROM is nil or omitted, the substring starts at the beginning of STRING.
152If FROM or TO is negative, it counts from the end.
153
154With one argument, just copy STRING without its properties."
155 (setq string (substring string (or from 0) to))
156 (set-text-properties 0 (length string) nil string)
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157 string))
158 ;; `line-number-at-pos' is available only in Emacs 22.1 or greater
159 ;; and XEmacs 21.5.
160 (line-number-at-pos
161 . ,(lambda (&optional pos)
162 "Return (narrowed) buffer line number at position POS.
163If POS is nil, use current buffer location.
164Counting starts at (point-min), so the value refers
165to the contents of the accessible portion of the buffer."
166 (let ((opoint (or pos (point))) start)
167 (save-excursion
168 (goto-char (point-min))
169 (setq start (point))
170 (goto-char opoint)
171 (forward-line 0)
172 (1+ (count-lines start (point))))))))))
f53b2875 173
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174;; `decode-coding-string', `encode-coding-string', `decode-coding-region'
175;; and `encode-coding-region' are available in Emacs and XEmacs built with
176;; the `file-coding' feature, but the XEmacs versions treat nil, that is
177;; given as the `coding-system' argument, as the `binary' coding system.
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178(eval-and-compile
179 (if (featurep 'xemacs)
180 (if (featurep 'file-coding)
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181 (progn
182 (defun mm-decode-coding-string (str coding-system)
183 (if coding-system
184 (decode-coding-string str coding-system)
185 str))
186 (defun mm-encode-coding-string (str coding-system)
187 (if coding-system
188 (encode-coding-string str coding-system)
189 str))
190 (defun mm-decode-coding-region (start end coding-system)
191 (if coding-system
192 (decode-coding-region start end coding-system)))
193 (defun mm-encode-coding-region (start end coding-system)
194 (if coding-system
195 (encode-coding-region start end coding-system))))
196 (defun mm-decode-coding-string (str coding-system) str)
197 (defun mm-encode-coding-string (str coding-system) str)
198 (defalias 'mm-decode-coding-region 'ignore)
199 (defalias 'mm-encode-coding-region 'ignore))
200 (defalias 'mm-decode-coding-string 'decode-coding-string)
201 (defalias 'mm-encode-coding-string 'encode-coding-string)
202 (defalias 'mm-decode-coding-region 'decode-coding-region)
203 (defalias 'mm-encode-coding-region 'encode-coding-region)))
204
e3e955fe 205;; `string-to-multibyte' is available only in Emacs 22.1 or greater.
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206(defalias 'mm-string-to-multibyte
207 (cond
208 ((featurep 'xemacs)
209 'identity)
210 ((fboundp 'string-to-multibyte)
211 'string-to-multibyte)
212 (t
213 (lambda (string)
c7948b5f 214 "Return a multibyte string with the same individual chars as STRING."
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215 (mapconcat
216 (lambda (ch) (mm-string-as-multibyte (char-to-string ch)))
217 string "")))))
218
e3e955fe 219;; `char-or-char-int-p' is an XEmacs function, not available in Emacs.
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220(eval-and-compile
221 (defalias 'mm-char-or-char-int-p
95fa1ff7 222 (cond
c113de23 223 ((fboundp 'char-or-char-int-p) 'char-or-char-int-p)
95fa1ff7 224 ((fboundp 'char-valid-p) 'char-valid-p)
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225 (t 'identity))))
226
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227;; `ucs-to-char' is a function that Mule-UCS provides.
228(if (featurep 'xemacs)
229 (cond ((and (fboundp 'unicode-to-char) ;; XEmacs 21.5.
230 (subrp (symbol-function 'unicode-to-char)))
231 (if (featurep 'mule)
232 (defalias 'mm-ucs-to-char 'unicode-to-char)
233 (defun mm-ucs-to-char (codepoint)
234 "Convert Unicode codepoint to character."
235 (or (unicode-to-char codepoint) ?#))))
236 ((featurep 'mule)
237 (defun mm-ucs-to-char (codepoint)
238 "Convert Unicode codepoint to character."
239 (if (fboundp 'ucs-to-char) ;; Mule-UCS is loaded.
240 (progn
241 (defalias 'mm-ucs-to-char
242 (lambda (codepoint)
243 "Convert Unicode codepoint to character."
244 (condition-case nil
245 (or (ucs-to-char codepoint) ?#)
246 (error ?#))))
247 (mm-ucs-to-char codepoint))
248 (condition-case nil
249 (or (int-to-char codepoint) ?#)
250 (error ?#)))))
251 (t
252 (defun mm-ucs-to-char (codepoint)
253 "Convert Unicode codepoint to character."
254 (condition-case nil
255 (or (int-to-char codepoint) ?#)
256 (error ?#)))))
257 (if (let ((char (make-char 'japanese-jisx0208 36 34)))
258 (eq char (decode-char 'ucs char)))
259 ;; Emacs 23.
260 (defalias 'mm-ucs-to-char 'identity)
261 (defun mm-ucs-to-char (codepoint)
262 "Convert Unicode codepoint to character."
263 (or (decode-char 'ucs codepoint) ?#))))
264
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265;; Fixme: This seems always to be used to read a MIME charset, so it
266;; should be re-named and fixed (in Emacs) to offer completion only on
267;; proper charset names (base coding systems which have a
268;; mime-charset defined). XEmacs doesn't believe in mime-charset;
269;; test with
270;; `(or (coding-system-get 'iso-8859-1 'mime-charset)
271;; (coding-system-get 'iso-8859-1 :mime-charset))'
272;; Actually, there should be an `mm-coding-system-mime-charset'.
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273(eval-and-compile
274 (defalias 'mm-read-coding-system
275 (cond
276 ((fboundp 'read-coding-system)
277 (if (and (featurep 'xemacs)
278 (<= (string-to-number emacs-version) 21.1))
279 (lambda (prompt &optional default-coding-system)
280 (read-coding-system prompt))
281 'read-coding-system))
282 (t (lambda (prompt &optional default-coding-system)
283 "Prompt the user for a coding system."
284 (completing-read
285 prompt (mapcar (lambda (s) (list (symbol-name (car s))))
286 mm-mime-mule-charset-alist)))))))
287
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288(defvar mm-coding-system-list nil)
289(defun mm-get-coding-system-list ()
290 "Get the coding system list."
291 (or mm-coding-system-list
292 (setq mm-coding-system-list (mm-coding-system-list))))
293
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294(defun mm-coding-system-p (cs)
295 "Return non-nil if CS is a symbol naming a coding system.
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296In XEmacs, also return non-nil if CS is a coding system object.
297If CS is available, return CS itself in Emacs, and return a coding
298system object in XEmacs."
23f87bed 299 (if (fboundp 'find-coding-system)
91472578 300 (and cs (find-coding-system cs))
23f87bed 301 (if (fboundp 'coding-system-p)
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302 (when (coding-system-p cs)
303 cs)
5f4264e5 304 ;; no-MULE XEmacs:
0683d241 305 (car (memq cs (mm-get-coding-system-list))))))
95fa1ff7 306
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307(defun mm-codepage-setup (number &optional alias)
308 "Create a coding system cpNUMBER.
309The coding system is created using `codepage-setup'. If ALIAS is
310non-nil, an alias is created and added to
311`mm-charset-synonym-alist'. If ALIAS is a string, it's used as
312the alias. Else windows-NUMBER is used."
313 (interactive
314 (let ((completion-ignore-case t)
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315 (candidates (if (fboundp 'cp-supported-codepages)
316 (cp-supported-codepages)
06b2d4c6 317 ;; Removed in Emacs 23 (unicode), so signal an error:
d93ec753 318 (error "`codepage-setup' not present in this Emacs version"))))
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319 (list (completing-read "Setup DOS Codepage: (default 437) " candidates
320 nil t nil nil "437"))))
321 (when alias
322 (setq alias (if (stringp alias)
323 (intern alias)
324 (intern (format "windows-%s" number)))))
325 (let* ((cp (intern (format "cp%s" number))))
326 (unless (mm-coding-system-p cp)
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327 (if (fboundp 'codepage-setup) ; silence compiler
328 (codepage-setup number)
d93ec753 329 (error "`codepage-setup' not present in this Emacs version")))
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330 (when (and alias
331 ;; Don't add alias if setup of cp failed.
332 (mm-coding-system-p cp))
333 (add-to-list 'mm-charset-synonym-alist (cons alias cp)))))
334
c113de23 335(defvar mm-charset-synonym-alist
95fa1ff7 336 `(
95fa1ff7 337 ;; Not in XEmacs, but it's not a proper MIME charset anyhow.
72eb5fc7 338 ,@(unless (mm-coding-system-p 'x-ctext)
b44409c9 339 '((x-ctext . ctext)))
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340 ;; ISO-8859-15 is very similar to ISO-8859-1. But it's _different_ in 8
341 ;; positions!
23f87bed 342 ,@(unless (mm-coding-system-p 'iso-8859-15)
b44409c9 343 '((iso-8859-15 . iso-8859-1)))
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344 ;; BIG-5HKSCS is similar to, but different than, BIG-5.
345 ,@(unless (mm-coding-system-p 'big5-hkscs)
346 '((big5-hkscs . big5)))
bd29ba20 347 ;; A Microsoft misunderstanding.
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348 ,@(when (and (not (mm-coding-system-p 'unicode))
349 (mm-coding-system-p 'utf-16-le))
350 '((unicode . utf-16-le)))
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351 ;; A Microsoft misunderstanding.
352 ,@(unless (mm-coding-system-p 'ks_c_5601-1987)
353 (if (mm-coding-system-p 'cp949)
354 '((ks_c_5601-1987 . cp949))
355 '((ks_c_5601-1987 . euc-kr))))
b44409c9 356 ;; Windows-31J is Windows Codepage 932.
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357 ,@(when (and (not (mm-coding-system-p 'windows-31j))
358 (mm-coding-system-p 'cp932))
359 '((windows-31j . cp932)))
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360 ;; Charset name: GBK, Charset aliases: CP936, MS936, windows-936
361 ;; http://www.iana.org/assignments/charset-reg/GBK
362 ;; Emacs 22.1 has cp936, but not gbk, so we alias it:
363 ,@(when (and (not (mm-coding-system-p 'gbk))
364 (mm-coding-system-p 'cp936))
365 '((gbk . cp936)))
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366 ;; UTF8 is a bogus name for UTF-8
367 ,@(when (and (not (mm-coding-system-p 'utf8))
368 (mm-coding-system-p 'utf-8))
369 '((utf8 . utf-8)))
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370 ;; ISO8859-1 is a bogus name for ISO-8859-1
371 ,@(when (and (not (mm-coding-system-p 'iso8859-1))
372 (mm-coding-system-p 'iso-8859-1))
373 '((iso8859-1 . iso-8859-1)))
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374 ;; ISO_8859-1 is a bogus name for ISO-8859-1
375 ,@(when (and (not (mm-coding-system-p 'iso_8859-1))
376 (mm-coding-system-p 'iso-8859-1))
377 '((iso_8859-1 . iso-8859-1)))
95fa1ff7 378 )
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379 "A mapping from unknown or invalid charset names to the real charset names.
380
381See `mm-codepage-iso-8859-list' and `mm-codepage-ibm-list'.")
382
383(defcustom mm-codepage-iso-8859-list
384 (list 1250 ;; Windows-1250 is a variant of Latin-2 heavily used by Microsoft
385 ;; Outlook users in Czech republic. Use this to allow reading of
386 ;; their e-mails. cp1250 should be defined by M-x codepage-setup
387 ;; (Emacs 21).
388 '(1252 . 1) ;; Windows-1252 is a superset of iso-8859-1 (West
389 ;; Europe). See also `gnus-article-dumbquotes-map'.
390 '(1254 . 9) ;; Windows-1254 is a superset of iso-8859-9 (Turkish).
391 '(1255 . 8));; Windows-1255 is a superset of iso-8859-8 (Hebrew).
392 "A list of Windows codepage numbers and iso-8859 charset numbers.
393
394If an element is a number corresponding to a supported windows
395codepage, appropriate entries to `mm-charset-synonym-alist' are
396added by `mm-setup-codepage-iso-8859'. An element may also be a
397cons cell where the car is a codepage number and the cdr is the
398corresponding number of an iso-8859 charset."
399 :type '(list (set :inline t
400 (const 1250 :tag "Central and East European")
401 (const (1252 . 1) :tag "West European")
402 (const (1254 . 9) :tag "Turkish")
403 (const (1255 . 8) :tag "Hebrew"))
404 (repeat :inline t
405 :tag "Other options"
406 (choice
407 (integer :tag "Windows codepage number")
408 (cons (integer :tag "Windows codepage number")
409 (integer :tag "iso-8859 charset number")))))
410 :version "22.1" ;; Gnus 5.10.9
411 :group 'mime)
412
413(defcustom mm-codepage-ibm-list
414 (list 437 ;; (US etc.)
415 860 ;; (Portugal)
416 861 ;; (Iceland)
417 862 ;; (Israel)
418 863 ;; (Canadian French)
419 865 ;; (Nordic)
420 852 ;;
421 850 ;; (Latin 1)
422 855 ;; (Cyrillic)
423 866 ;; (Cyrillic - Russian)
424 857 ;; (Turkish)
425 864 ;; (Arabic)
426 869 ;; (Greek)
427 874);; (Thai)
428 ;; In Emacs 23 (unicode), cp... and ibm... are aliases.
429 ;; Cf. http://thread.gmane.org/v9lkng5nwy.fsf@marauder.physik.uni-ulm.de
430 "List of IBM codepage numbers.
431
432The codepage mappings slighly differ between IBM and other vendors.
433See \"ftp://ftp.unicode.org/Public/MAPPINGS/VENDORS/IBM/README.TXT\".
434
435If an element is a number corresponding to a supported windows
436codepage, appropriate entries to `mm-charset-synonym-alist' are
437added by `mm-setup-codepage-ibm'."
438 :type '(list (set :inline t
439 (const 437 :tag "US etc.")
440 (const 860 :tag "Portugal")
441 (const 861 :tag "Iceland")
442 (const 862 :tag "Israel")
443 (const 863 :tag "Canadian French")
444 (const 865 :tag "Nordic")
445 (const 852)
446 (const 850 :tag "Latin 1")
447 (const 855 :tag "Cyrillic")
448 (const 866 :tag "Cyrillic - Russian")
449 (const 857 :tag "Turkish")
450 (const 864 :tag "Arabic")
451 (const 869 :tag "Greek")
452 (const 874 :tag "Thai"))
453 (repeat :inline t
454 :tag "Other options"
455 (integer :tag "Codepage number")))
456 :version "22.1" ;; Gnus 5.10.9
457 :group 'mime)
458
459(defun mm-setup-codepage-iso-8859 (&optional list)
460 "Add appropriate entries to `mm-charset-synonym-alist'.
461Unless LIST is given, `mm-codepage-iso-8859-list' is used."
462 (unless list
463 (setq list mm-codepage-iso-8859-list))
464 (dolist (i list)
465 (let (cp windows iso)
466 (if (consp i)
467 (setq cp (intern (format "cp%d" (car i)))
468 windows (intern (format "windows-%d" (car i)))
469 iso (intern (format "iso-8859-%d" (cdr i))))
470 (setq cp (intern (format "cp%d" i))
471 windows (intern (format "windows-%d" i))))
472 (unless (mm-coding-system-p windows)
473 (if (mm-coding-system-p cp)
474 (add-to-list 'mm-charset-synonym-alist (cons windows cp))
475 (add-to-list 'mm-charset-synonym-alist (cons windows iso)))))))
476
477(defun mm-setup-codepage-ibm (&optional list)
478 "Add appropriate entries to `mm-charset-synonym-alist'.
479Unless LIST is given, `mm-codepage-ibm-list' is used."
480 (unless list
481 (setq list mm-codepage-ibm-list))
482 (dolist (number list)
483 (let ((ibm (intern (format "ibm%d" number)))
484 (cp (intern (format "cp%d" number))))
485 (when (and (not (mm-coding-system-p ibm))
486 (mm-coding-system-p cp))
487 (add-to-list 'mm-charset-synonym-alist (cons ibm cp))))))
488
489;; Initialize:
490(mm-setup-codepage-iso-8859)
491(mm-setup-codepage-ibm)
bd29ba20 492
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493;; Note: this has to be defined before `mm-charset-to-coding-system'.
494(defcustom mm-charset-eval-alist
495 (if (featurep 'xemacs)
496 nil ;; I don't know what would be useful for XEmacs.
497 '(;; Emacs 21 offers 1250 1251 1253 1257. Emacs 22 provides autoloads for
498 ;; 1250-1258 (i.e. `mm-codepage-setup' does nothing).
499 (windows-1250 . (mm-codepage-setup 1250 t))
500 (windows-1251 . (mm-codepage-setup 1251 t))
501 (windows-1253 . (mm-codepage-setup 1253 t))
502 (windows-1257 . (mm-codepage-setup 1257 t))))
503 "An alist of (CHARSET . FORM) pairs.
504If an article is encoded in an unknown CHARSET, FORM is
505evaluated. This allows to load additional libraries providing
506charsets on demand. If supported by your Emacs version, you
507could use `autoload-coding-system' here."
508 :version "22.1" ;; Gnus 5.10.9
509 :type '(list (set :inline t
510 (const (windows-1250 . (mm-codepage-setup 1250 t)))
511 (const (windows-1251 . (mm-codepage-setup 1251 t)))
512 (const (windows-1253 . (mm-codepage-setup 1253 t)))
513 (const (windows-1257 . (mm-codepage-setup 1257 t)))
514 (const (cp850 . (mm-codepage-setup 850 nil))))
515 (repeat :inline t
516 :tag "Other options"
517 (cons (symbol :tag "charset")
518 (symbol :tag "form"))))
519 :group 'mime)
520(put 'mm-charset-eval-alist 'risky-local-variable t)
521
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522(defvar mm-charset-override-alist)
523
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524;; Note: this function has to be defined before `mm-charset-override-alist'
525;; since it will use this function in order to determine its default value
526;; when loading mm-util.elc.
527(defun mm-charset-to-coding-system (charset &optional lbt
528 allow-override silent)
529 "Return coding-system corresponding to CHARSET.
530CHARSET is a symbol naming a MIME charset.
531If optional argument LBT (`unix', `dos' or `mac') is specified, it is
532used as the line break code type of the coding system.
533
534If ALLOW-OVERRIDE is given, use `mm-charset-override-alist' to
535map undesired charset names to their replacement. This should
536only be used for decoding, not for encoding.
537
538A non-nil value of SILENT means don't issue a warning even if CHARSET
539is not available."
540 ;; OVERRIDE is used (only) in `mm-decode-body' and `mm-decode-string'.
541 (when (stringp charset)
542 (setq charset (intern (downcase charset))))
543 (when lbt
544 (setq charset (intern (format "%s-%s" charset lbt))))
545 (cond
546 ((null charset)
547 charset)
548 ;; Running in a non-MULE environment.
549 ((or (null (mm-get-coding-system-list))
550 (not (fboundp 'coding-system-get)))
551 charset)
552 ;; Check override list quite early. Should only used for decoding, not for
553 ;; encoding!
554 ((and allow-override
555 (let ((cs (cdr (assq charset mm-charset-override-alist))))
556 (and cs (mm-coding-system-p cs) cs))))
557 ;; ascii
558 ((eq charset 'us-ascii)
559 'ascii)
560 ;; Check to see whether we can handle this charset. (This depends
561 ;; on there being some coding system matching each `mime-charset'
562 ;; property defined, as there should be.)
563 ((and (mm-coding-system-p charset)
564;;; Doing this would potentially weed out incorrect charsets.
565;;; charset
566;;; (eq charset (coding-system-get charset 'mime-charset))
567 )
568 charset)
569 ;; Eval expressions from `mm-charset-eval-alist'
570 ((let* ((el (assq charset mm-charset-eval-alist))
571 (cs (car el))
572 (form (cdr el)))
573 (and cs
574 form
575 (prog2
576 ;; Avoid errors...
577 (condition-case nil (eval form) (error nil))
578 ;; (message "Failed to eval `%s'" form))
579 (mm-coding-system-p cs)
580 (message "Added charset `%s' via `mm-charset-eval-alist'" cs))
581 cs)))
582 ;; Translate invalid charsets.
583 ((let ((cs (cdr (assq charset mm-charset-synonym-alist))))
584 (and cs
585 (mm-coding-system-p cs)
586 ;; (message
587 ;; "Using synonym `%s' from `mm-charset-synonym-alist' for `%s'"
588 ;; cs charset)
589 cs)))
590 ;; Last resort: search the coding system list for entries which
591 ;; have the right mime-charset in case the canonical name isn't
592 ;; defined (though it should be).
593 ((let (cs)
594 ;; mm-get-coding-system-list returns a list of cs without lbt.
595 ;; Do we need -lbt?
596 (dolist (c (mm-get-coding-system-list))
597 (if (and (null cs)
598 (eq charset (or (coding-system-get c :mime-charset)
599 (coding-system-get c 'mime-charset))))
600 (setq cs c)))
601 (unless (or silent cs)
602 ;; Warn the user about unknown charset:
603 (if (fboundp 'gnus-message)
604 (gnus-message 7 "Unknown charset: %s" charset)
605 (message "Unknown charset: %s" charset)))
606 cs))))
607
608;; Note: `mm-charset-to-coding-system' has to be defined before this.
bd29ba20 609(defcustom mm-charset-override-alist
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610 ;; Note: pairs that cannot be used in the Emacs version currently running
611 ;; will be removed.
612 '((gb2312 . gbk)
613 (iso-8859-1 . windows-1252)
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614 (iso-8859-8 . windows-1255)
615 (iso-8859-9 . windows-1254))
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616 "A mapping from undesired charset names to their replacement.
617
618You may add pairs like (iso-8859-1 . windows-1252) here,
619i.e. treat iso-8859-1 as windows-1252. windows-1252 is a
620superset of iso-8859-1."
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621 :type
622 '(list
623 :convert-widget
624 (lambda (widget)
625 (let ((defaults
626 (delq nil
627 (mapcar (lambda (pair)
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628 (if (mm-charset-to-coding-system (cdr pair)
629 nil nil t)
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630 pair))
631 '((gb2312 . gbk)
632 (iso-8859-1 . windows-1252)
633 (iso-8859-8 . windows-1255)
634 (iso-8859-9 . windows-1254)
635 (undecided . windows-1252)))))
636 (val (copy-sequence (default-value 'mm-charset-override-alist)))
637 pair rest)
638 (while val
639 (push (if (and (prog1
640 (setq pair (assq (caar val) defaults))
641 (setq defaults (delq pair defaults)))
642 (equal (car val) pair))
643 `(const ,pair)
644 `(cons :format "%v"
645 (const :format "(%v" ,(caar val))
646 (symbol :size 3 :format " . %v)\n" ,(cdar val))))
647 rest)
648 (setq val (cdr val)))
649 (while defaults
650 (push `(const ,(pop defaults)) rest))
651 (widget-convert
652 'list
653 `(set :inline t :format "%v" ,@(nreverse rest))
654 `(repeat :inline t :tag "Other options"
655 (cons :format "%v"
656 (symbol :size 3 :format "(%v")
657 (symbol :size 3 :format " . %v)\n")))))))
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658 ;; Remove pairs that cannot be used in the Emacs version currently
659 ;; running. Note that this section will be evaluated when loading
660 ;; mm-util.elc.
661 :set (lambda (symbol value)
662 (custom-set-default
663 symbol (delq nil
664 (mapcar (lambda (pair)
665 (if (mm-charset-to-coding-system (cdr pair)
666 nil nil t)
667 pair))
668 value))))
67099291 669 :version "22.1" ;; Gnus 5.10.9
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670 :group 'mime)
671
c113de23 672(defvar mm-binary-coding-system
95fa1ff7 673 (cond
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674 ((mm-coding-system-p 'binary) 'binary)
675 ((mm-coding-system-p 'no-conversion) 'no-conversion)
676 (t nil))
677 "100% binary coding system.")
678
679(defvar mm-text-coding-system
680 (or (if (memq system-type '(windows-nt ms-dos ms-windows))
681 (and (mm-coding-system-p 'raw-text-dos) 'raw-text-dos)
682 (and (mm-coding-system-p 'raw-text) 'raw-text))
683 mm-binary-coding-system)
684 "Text-safe coding system (For removing ^M).")
685
686(defvar mm-text-coding-system-for-write nil
687 "Text coding system for write.")
688
689(defvar mm-auto-save-coding-system
95fa1ff7 690 (cond
23f87bed 691 ((mm-coding-system-p 'utf-8-emacs) ; Mule 7
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692 (if (memq system-type '(windows-nt ms-dos ms-windows))
693 (if (mm-coding-system-p 'utf-8-emacs-dos)
694 'utf-8-emacs-dos mm-binary-coding-system)
695 'utf-8-emacs))
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696 ((mm-coding-system-p 'emacs-mule)
697 (if (memq system-type '(windows-nt ms-dos ms-windows))
95fa1ff7 698 (if (mm-coding-system-p 'emacs-mule-dos)
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699 'emacs-mule-dos mm-binary-coding-system)
700 'emacs-mule))
701 ((mm-coding-system-p 'escape-quoted) 'escape-quoted)
702 (t mm-binary-coding-system))
703 "Coding system of auto save file.")
704
95fa1ff7 705(defvar mm-universal-coding-system mm-auto-save-coding-system
47b63dfa 706 "The universal coding system.")
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707
708;; Fixme: some of the cars here aren't valid MIME charsets. That
709;; should only matter with XEmacs, though.
710(defvar mm-mime-mule-charset-alist
711 `((us-ascii ascii)
712 (iso-8859-1 latin-iso8859-1)
713 (iso-8859-2 latin-iso8859-2)
714 (iso-8859-3 latin-iso8859-3)
715 (iso-8859-4 latin-iso8859-4)
716 (iso-8859-5 cyrillic-iso8859-5)
717 ;; Non-mule (X)Emacs uses the last mule-charset for 8bit characters.
718 ;; The fake mule-charset, gnus-koi8-r, tells Gnus that the default
719 ;; charset is koi8-r, not iso-8859-5.
720 (koi8-r cyrillic-iso8859-5 gnus-koi8-r)
721 (iso-8859-6 arabic-iso8859-6)
722 (iso-8859-7 greek-iso8859-7)
723 (iso-8859-8 hebrew-iso8859-8)
724 (iso-8859-9 latin-iso8859-9)
725 (iso-8859-14 latin-iso8859-14)
726 (iso-8859-15 latin-iso8859-15)
727 (viscii vietnamese-viscii-lower)
728 (iso-2022-jp latin-jisx0201 japanese-jisx0208 japanese-jisx0208-1978)
729 (euc-kr korean-ksc5601)
730 (gb2312 chinese-gb2312)
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731 (gbk chinese-gbk)
732 (gb18030 gb18030-2-byte
733 gb18030-4-byte-bmp gb18030-4-byte-smp
734 gb18030-4-byte-ext-1 gb18030-4-byte-ext-2)
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735 (big5 chinese-big5-1 chinese-big5-2)
736 (tibetan tibetan)
737 (thai-tis620 thai-tis620)
0683d241 738 (windows-1251 cyrillic-iso8859-5)
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739 (iso-2022-7bit ethiopic arabic-1-column arabic-2-column)
740 (iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
741 latin-jisx0201 japanese-jisx0208-1978
742 chinese-gb2312 japanese-jisx0208
0683d241 743 korean-ksc5601 japanese-jisx0212)
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744 (iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
745 latin-jisx0201 japanese-jisx0208-1978
746 chinese-gb2312 japanese-jisx0208
747 korean-ksc5601 japanese-jisx0212
748 chinese-cns11643-1 chinese-cns11643-2)
749 (iso-2022-int-1 latin-iso8859-1 latin-iso8859-2
750 cyrillic-iso8859-5 greek-iso8859-7
751 latin-jisx0201 japanese-jisx0208-1978
752 chinese-gb2312 japanese-jisx0208
753 korean-ksc5601 japanese-jisx0212
754 chinese-cns11643-1 chinese-cns11643-2
755 chinese-cns11643-3 chinese-cns11643-4
756 chinese-cns11643-5 chinese-cns11643-6
757 chinese-cns11643-7)
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758 (iso-2022-jp-3 latin-jisx0201 japanese-jisx0208-1978 japanese-jisx0208
759 japanese-jisx0213-1 japanese-jisx0213-2)
760 (shift_jis latin-jisx0201 katakana-jisx0201 japanese-jisx0208)
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761 ,(cond ((fboundp 'unicode-precedence-list)
762 (cons 'utf-8 (delq 'ascii (mapcar 'charset-name
763 (unicode-precedence-list)))))
764 ((or (not (fboundp 'charsetp)) ;; non-Mule case
765 (charsetp 'unicode-a)
766 (not (mm-coding-system-p 'mule-utf-8)))
767 '(utf-8 unicode-a unicode-b unicode-c unicode-d unicode-e))
768 (t ;; If we have utf-8 we're in Mule 5+.
769 (append '(utf-8)
770 (delete 'ascii
771 (coding-system-get 'mule-utf-8 'safe-charsets))))))
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772 "Alist of MIME-charset/MULE-charsets.")
773
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774(defun mm-enrich-utf-8-by-mule-ucs ()
775 "Make the `utf-8' MIME charset usable by the Mule-UCS package.
776This function will run when the `un-define' module is loaded under
777XEmacs, and fill the `utf-8' entry in `mm-mime-mule-charset-alist'
778with Mule charsets. It is completely useless for Emacs."
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779 (when (boundp 'unicode-basic-translation-charset-order-list)
780 (condition-case nil
781 (let ((val (delq
782 'ascii
783 (copy-sequence
784 (symbol-value
785 'unicode-basic-translation-charset-order-list))))
786 (elem (assq 'utf-8 mm-mime-mule-charset-alist)))
787 (if elem
788 (setcdr elem val)
789 (setq mm-mime-mule-charset-alist
790 (nconc mm-mime-mule-charset-alist
791 (list (cons 'utf-8 val))))))
792 (error))))
793
794;; Correct by construction, but should be unnecessary for Emacs:
795(if (featurep 'xemacs)
796 (eval-after-load "un-define" '(mm-enrich-utf-8-by-mule-ucs))
797 (when (and (fboundp 'coding-system-list)
798 (fboundp 'sort-coding-systems))
799 (let ((css (sort-coding-systems (coding-system-list 'base-only)))
800 cs mime mule alist)
801 (while css
802 (setq cs (pop css)
5432dcf9 803 mime (or (coding-system-get cs :mime-charset); Emacs 23 (unicode)
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804 (coding-system-get cs 'mime-charset)))
805 (when (and mime
806 (not (eq t (setq mule
807 (coding-system-get cs 'safe-charsets))))
808 (not (assq mime alist)))
809 (push (cons mime (delq 'ascii mule)) alist)))
810 (setq mm-mime-mule-charset-alist (nreverse alist)))))
95fa1ff7 811
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812(defvar mm-hack-charsets '(iso-8859-15 iso-2022-jp-2)
813 "A list of special charsets.
814Valid elements include:
815`iso-8859-15' convert ISO-8859-1, -9 to ISO-8859-15 if ISO-8859-15 exists.
816`iso-2022-jp-2' convert ISO-2022-jp to ISO-2022-jp-2 if ISO-2022-jp-2 exists."
817)
818
819(defvar mm-iso-8859-15-compatible
820 '((iso-8859-1 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE")
821 (iso-8859-9 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE\xD0\xDD\xDE\xF0\xFD\xFE"))
822 "ISO-8859-15 exchangeable coding systems and inconvertible characters.")
823
824(defvar mm-iso-8859-x-to-15-table
825 (and (fboundp 'coding-system-p)
826 (mm-coding-system-p 'iso-8859-15)
827 (mapcar
828 (lambda (cs)
829 (if (mm-coding-system-p (car cs))
830 (let ((c (string-to-char
831 (decode-coding-string "\341" (car cs)))))
832 (cons (char-charset c)
833 (cons
834 (- (string-to-char
835 (decode-coding-string "\341" 'iso-8859-15)) c)
836 (string-to-list (decode-coding-string (car (cdr cs))
837 (car cs))))))
838 '(gnus-charset 0)))
839 mm-iso-8859-15-compatible))
840 "A table of the difference character between ISO-8859-X and ISO-8859-15.")
841
23f87bed 842(defcustom mm-coding-system-priorities
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843 (let ((lang (if (boundp 'current-language-environment)
844 (symbol-value 'current-language-environment))))
845 (cond (;; XEmacs without Mule but with `file-coding'.
846 (not lang) nil)
847 ;; In XEmacs 21.5 it may be the one like "Japanese (UTF-8)".
848 ((string-match "\\`Japanese" lang)
849 ;; Japanese users prefer iso-2022-jp to euc-japan or
850 ;; shift_jis, however iso-8859-1 should be used when
851 ;; there are only ASCII text and Latin-1 characters.
852 '(iso-8859-1 iso-2022-jp iso-2022-jp-2 shift_jis utf-8))))
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853 "Preferred coding systems for encoding outgoing messages.
854
855More than one suitable coding system may be found for some text.
856By default, the coding system with the highest priority is used
857to encode outgoing messages (see `sort-coding-systems'). If this
858variable is set, it overrides the default priority."
a08b59c9 859 :version "21.2"
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860 :type '(repeat (symbol :tag "Coding system"))
861 :group 'mime)
862
863;; ??
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864(defvar mm-use-find-coding-systems-region
865 (fboundp 'find-coding-systems-region)
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866 "Use `find-coding-systems-region' to find proper coding systems.
867
868Setting it to nil is useful on Emacsen supporting Unicode if sending
869mail with multiple parts is preferred to sending a Unicode one.")
1f7d2e14 870
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871;;; Internal variables:
872
873;;; Functions:
874
875(defun mm-mule-charset-to-mime-charset (charset)
1c57d870 876 "Return the MIME charset corresponding to the given Mule CHARSET."
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877 (if (and (fboundp 'find-coding-systems-for-charsets)
878 (fboundp 'sort-coding-systems))
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879 (let ((css (sort (sort-coding-systems
880 (find-coding-systems-for-charsets (list charset)))
881 'mm-sort-coding-systems-predicate))
882 cs mime)
883 (while (and (not mime)
884 css)
885 (when (setq cs (pop css))
886 (setq mime (or (coding-system-get cs :mime-charset)
887 (coding-system-get cs 'mime-charset)))))
95fa1ff7 888 mime)
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889 (let ((alist (mapcar (lambda (cs)
890 (assq cs mm-mime-mule-charset-alist))
891 (sort (mapcar 'car mm-mime-mule-charset-alist)
892 'mm-sort-coding-systems-predicate)))
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893 out)
894 (while alist
895 (when (memq charset (cdar alist))
896 (setq out (caar alist)
897 alist nil))
898 (pop alist))
899 out)))
c113de23 900
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901(eval-and-compile
902 (defvar mm-emacs-mule (and (not (featurep 'xemacs))
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903 (boundp 'enable-multibyte-characters)
904 (default-value 'enable-multibyte-characters)
95fa1ff7 905 (fboundp 'set-buffer-multibyte))
56e09c09 906 "True in Emacs with Mule.")
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907
908 (if mm-emacs-mule
909 (defun mm-enable-multibyte ()
910 "Set the multibyte flag of the current buffer.
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911Only do this if the default value of `enable-multibyte-characters' is
912non-nil. This is a no-op in XEmacs."
473ad4a5 913 (set-buffer-multibyte 'to))
95fa1ff7 914 (defalias 'mm-enable-multibyte 'ignore))
c113de23 915
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916 (if mm-emacs-mule
917 (defun mm-disable-multibyte ()
918 "Unset the multibyte flag of in the current buffer.
1c57d870 919This is a no-op in XEmacs."
95fa1ff7 920 (set-buffer-multibyte nil))
56e09c09 921 (defalias 'mm-disable-multibyte 'ignore)))
052802c1 922
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923(defun mm-preferred-coding-system (charset)
924 ;; A typo in some Emacs versions.
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925 (or (get-charset-property charset 'preferred-coding-system)
926 (get-charset-property charset 'prefered-coding-system)))
c113de23 927
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928;; Mule charsets shouldn't be used.
929(defsubst mm-guess-charset ()
930 "Guess Mule charset from the language environment."
931 (or
932 mail-parse-mule-charset ;; cached mule-charset
933 (progn
934 (setq mail-parse-mule-charset
935 (and (boundp 'current-language-environment)
936 (car (last
937 (assq 'charset
938 (assoc current-language-environment
939 language-info-alist))))))
940 (if (or (not mail-parse-mule-charset)
941 (eq mail-parse-mule-charset 'ascii))
942 (setq mail-parse-mule-charset
943 (or (car (last (assq mail-parse-charset
944 mm-mime-mule-charset-alist)))
945 ;; default
946 'latin-iso8859-1)))
947 mail-parse-mule-charset)))
948
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949(defun mm-charset-after (&optional pos)
950 "Return charset of a character in current buffer at position POS.
951If POS is nil, it defauls to the current point.
952If POS is out of range, the value is nil.
953If the charset is `composition', return the actual one."
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954 (let ((char (char-after pos)) charset)
955 (if (< (mm-char-int char) 128)
956 (setq charset 'ascii)
957 ;; charset-after is fake in some Emacsen.
958 (setq charset (and (fboundp 'char-charset) (char-charset char)))
56e09c09 959 (if (eq charset 'composition) ; Mule 4
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960 (let ((p (or pos (point))))
961 (cadr (find-charset-region p (1+ p))))
962 (if (and charset (not (memq charset '(ascii eight-bit-control
963 eight-bit-graphic))))
964 charset
23f87bed 965 (mm-guess-charset))))))
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966
967(defun mm-mime-charset (charset)
1c57d870 968 "Return the MIME charset corresponding to the given Mule CHARSET."
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969 (if (eq charset 'unknown)
970 (error "The message contains non-printable characters, please use attachment"))
052802c1 971 (if (and (fboundp 'coding-system-get) (fboundp 'get-charset-property))
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972 ;; This exists in Emacs 20.
973 (or
974 (and (mm-preferred-coding-system charset)
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975 (or (coding-system-get
976 (mm-preferred-coding-system charset) :mime-charset)
977 (coding-system-get
978 (mm-preferred-coding-system charset) 'mime-charset)))
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979 (and (eq charset 'ascii)
980 'us-ascii)
95fa1ff7 981 (mm-preferred-coding-system charset)
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982 (mm-mule-charset-to-mime-charset charset))
983 ;; This is for XEmacs.
984 (mm-mule-charset-to-mime-charset charset)))
985
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986(if (fboundp 'delete-dups)
987 (defalias 'mm-delete-duplicates 'delete-dups)
988 (defun mm-delete-duplicates (list)
989 "Destructively remove `equal' duplicates from LIST.
990Store the result in LIST and return it. LIST must be a proper list.
991Of several `equal' occurrences of an element in LIST, the first
992one is kept.
993
994This is a compatibility function for Emacsen without `delete-dups'."
995 ;; Code from `subr.el' in Emacs 22:
996 (let ((tail list))
997 (while tail
998 (setcdr tail (delete (car tail) (cdr tail)))
999 (setq tail (cdr tail))))
1000 list))
c113de23 1001
23f87bed
MB
1002;; Fixme: This is used in places when it should be testing the
1003;; default multibyteness. See mm-default-multibyte-p.
1004(eval-and-compile
052802c1
DL
1005 (if (and (not (featurep 'xemacs))
1006 (boundp 'enable-multibyte-characters))
23f87bed
MB
1007 (defun mm-multibyte-p ()
1008 "Non-nil if multibyte is enabled in the current buffer."
1009 enable-multibyte-characters)
1010 (defun mm-multibyte-p () (featurep 'mule))))
1011
1012(defun mm-default-multibyte-p ()
1013 "Return non-nil if the session is multibyte.
1014This affects whether coding conversion should be attempted generally."
1015 (if (featurep 'mule)
2e62b574
GM
1016 (if (boundp 'enable-multibyte-characters)
1017 (default-value 'enable-multibyte-characters)
23f87bed 1018 t)))
c113de23 1019
f5490ddc
MB
1020(defun mm-iso-8859-x-to-15-region (&optional b e)
1021 (if (fboundp 'char-charset)
1022 (let (charset item c inconvertible)
1023 (save-restriction
1024 (if e (narrow-to-region b e))
1025 (goto-char (point-min))
1026 (skip-chars-forward "\0-\177")
1027 (while (not (eobp))
1028 (cond
1029 ((not (setq item (assq (char-charset (setq c (char-after)))
1030 mm-iso-8859-x-to-15-table)))
1031 (forward-char))
1032 ((memq c (cdr (cdr item)))
1033 (setq inconvertible t)
1034 (forward-char))
1035 (t
1036 (insert-before-markers (prog1 (+ c (car (cdr item)))
1037 (delete-char 1)))))
1038 (skip-chars-forward "\0-\177")))
1039 (not inconvertible))))
1040
47b63dfa 1041(defun mm-sort-coding-systems-predicate (a b)
23f87bed
MB
1042 (let ((priorities
1043 (mapcar (lambda (cs)
1044 ;; Note: invalid entries are dropped silently
0683d241 1045 (and (setq cs (mm-coding-system-p cs))
23f87bed
MB
1046 (coding-system-base cs)))
1047 mm-coding-system-priorities)))
0683d241
MB
1048 (and (setq a (mm-coding-system-p a))
1049 (if (setq b (mm-coding-system-p b))
1050 (> (length (memq (coding-system-base a) priorities))
1051 (length (memq (coding-system-base b) priorities)))
1052 t))))
47b63dfa 1053
aa0a8561
MB
1054(eval-when-compile
1055 (autoload 'latin-unity-massage-name "latin-unity")
1056 (autoload 'latin-unity-maybe-remap "latin-unity")
1057 (autoload 'latin-unity-representations-feasible-region "latin-unity")
9efa445f
DN
1058 (autoload 'latin-unity-representations-present-region "latin-unity"))
1059
1060(defvar latin-unity-coding-systems)
1061(defvar latin-unity-ucs-list)
aa0a8561
MB
1062
1063(defun mm-xemacs-find-mime-charset-1 (begin end)
1064 "Determine which MIME charset to use to send region as message.
1065This uses the XEmacs-specific latin-unity package to better handle the
1066case where identical characters from diverse ISO-8859-? character sets
1067can be encoded using a single one of the corresponding coding systems.
1068
1069It treats `mm-coding-system-priorities' as the list of preferred
1070coding systems; a useful example setting for this list in Western
1071Europe would be '(iso-8859-1 iso-8859-15 utf-8), which would default
1072to the very standard Latin 1 coding system, and only move to coding
1073systems that are less supported as is necessary to encode the
1074characters that exist in the buffer.
1075
1076Latin Unity doesn't know about those non-ASCII Roman characters that
1077are available in various East Asian character sets. As such, its
1078behavior if you have a JIS 0212 LATIN SMALL LETTER A WITH ACUTE in a
1079buffer and it can otherwise be encoded as Latin 1, won't be ideal.
1080But this is very much a corner case, so don't worry about it."
1081 (let ((systems mm-coding-system-priorities) csets psets curset)
1082
1083 ;; Load the Latin Unity library, if available.
1084 (when (and (not (featurep 'latin-unity)) (locate-library "latin-unity"))
01c52d31 1085 (require 'latin-unity))
aa0a8561
MB
1086
1087 ;; Now, can we use it?
1088 (if (featurep 'latin-unity)
1089 (progn
1090 (setq csets (latin-unity-representations-feasible-region begin end)
1091 psets (latin-unity-representations-present-region begin end))
1092
1093 (catch 'done
1094
1095 ;; Pass back the first coding system in the preferred list
1096 ;; that can encode the whole region.
1097 (dolist (curset systems)
1098 (setq curset (latin-unity-massage-name 'buffer-default curset))
1099
1100 ;; If the coding system is a universal coding system, then
1101 ;; it can certainly encode all the characters in the region.
1102 (if (memq curset latin-unity-ucs-list)
1103 (throw 'done (list curset)))
1104
1105 ;; If a coding system isn't universal, and isn't in
1106 ;; the list that latin unity knows about, we can't
1107 ;; decide whether to use it here. Leave that until later
1108 ;; in `mm-find-mime-charset-region' function, whence we
1109 ;; have been called.
1110 (unless (memq curset latin-unity-coding-systems)
1111 (throw 'done nil))
1112
1113 ;; Right, we know about this coding system, and it may
1114 ;; conceivably be able to encode all the characters in
1115 ;; the region.
1116 (if (latin-unity-maybe-remap begin end curset csets psets t)
1117 (throw 'done (list curset))))
1118
1119 ;; Can't encode using anything from the
1120 ;; `mm-coding-system-priorities' list.
1121 ;; Leave `mm-find-mime-charset' to do most of the work.
1122 nil))
1123
1124 ;; Right, latin unity isn't available; let `mm-find-charset-region'
1125 ;; take its default action, which equally applies to GNU Emacs.
1126 nil)))
1127
1128(defmacro mm-xemacs-find-mime-charset (begin end)
1129 (when (featurep 'xemacs)
10ace8ea 1130 `(and (featurep 'mule) (mm-xemacs-find-mime-charset-1 ,begin ,end))))
aa0a8561 1131
b5000590
GM
1132(declare-function mm-delete-duplicates "mm-util" (list))
1133
47b63dfa 1134(defun mm-find-mime-charset-region (b e &optional hack-charsets)
95fa1ff7 1135 "Return the MIME charsets needed to encode the region between B and E.
f0529b5b 1136nil means ASCII, a single-element list represents an appropriate MIME
95fa1ff7 1137charset, and a longer list means no appropriate charset."
47b63dfa
SZ
1138 (let (charsets)
1139 ;; The return possibilities of this function are a mess...
1140 (or (and (mm-multibyte-p)
1f7d2e14 1141 mm-use-find-coding-systems-region
47b63dfa
SZ
1142 ;; Find the mime-charset of the most preferred coding
1143 ;; system that has one.
1144 (let ((systems (find-coding-systems-region b e)))
1145 (when mm-coding-system-priorities
a1506d29 1146 (setq systems
47b63dfa 1147 (sort systems 'mm-sort-coding-systems-predicate)))
47b63dfa
SZ
1148 (setq systems (delq 'compound-text systems))
1149 (unless (equal systems '(undecided))
1150 (while systems
56e09c09
DL
1151 (let* ((head (pop systems))
1152 (cs (or (coding-system-get head :mime-charset)
1153 (coding-system-get head 'mime-charset))))
23f87bed
MB
1154 ;; The mime-charset (`x-ctext') of
1155 ;; `compound-text' is not in the IANA list. We
1156 ;; shouldn't normally use anything here with a
1157 ;; mime-charset having an `x-' prefix.
1158 ;; Fixme: Allow this to be overridden, since
1159 ;; there is existing use of x-ctext.
1160 ;; Also people apparently need the coding system
1161 ;; `iso-2022-jp-3' (which Mule-UCS defines with
1162 ;; mime-charset, though it's not valid).
1163 (if (and cs
1164 (not (string-match "^[Xx]-" (symbol-name cs)))
1165 ;; UTF-16 of any variety is invalid for
1166 ;; text parts and, unfortunately, has
1167 ;; mime-charset defined both in Mule-UCS
1168 ;; and versions of Emacs. (The name
1169 ;; might be `mule-utf-16...' or
1170 ;; `utf-16...'.)
1171 (not (string-match "utf-16" (symbol-name cs))))
47b63dfa
SZ
1172 (setq systems nil
1173 charsets (list cs))))))
1174 charsets))
aa0a8561
MB
1175 ;; If we're XEmacs, and some coding system is appropriate,
1176 ;; mm-xemacs-find-mime-charset will return an appropriate list.
1177 ;; Otherwise, we'll get nil, and the next setq will get invoked.
1178 (setq charsets (mm-xemacs-find-mime-charset b e))
1179
8589dc17 1180 ;; Fixme: won't work for unibyte Emacs 23:
0c129bca 1181
aa0a8561 1182 ;; We're not multibyte, or a single coding system won't cover it.
a1506d29 1183 (setq charsets
47b63dfa
SZ
1184 (mm-delete-duplicates
1185 (mapcar 'mm-mime-charset
1186 (delq 'ascii
1187 (mm-find-charset-region b e))))))
f5490ddc
MB
1188 (if (and (> (length charsets) 1)
1189 (memq 'iso-8859-15 charsets)
1190 (memq 'iso-8859-15 hack-charsets)
1191 (save-excursion (mm-iso-8859-x-to-15-region b e)))
1192 (dolist (x mm-iso-8859-15-compatible)
1193 (setq charsets (delq (car x) charsets))))
1194 (if (and (memq 'iso-2022-jp-2 charsets)
1195 (memq 'iso-2022-jp-2 hack-charsets))
1196 (setq charsets (delq 'iso-2022-jp charsets)))
1197 ;; Attempt to reduce the number of charsets if utf-8 is available.
1198 (if (and (featurep 'xemacs)
1199 (> (length charsets) 1)
1200 (mm-coding-system-p 'utf-8))
1201 (let ((mm-coding-system-priorities
1202 (cons 'utf-8 mm-coding-system-priorities)))
1203 (setq charsets
1204 (mm-delete-duplicates
1205 (mapcar 'mm-mime-charset
1206 (delq 'ascii
1207 (mm-find-charset-region b e)))))))
47b63dfa 1208 charsets))
95fa1ff7 1209
c113de23
GM
1210(defmacro mm-with-unibyte-buffer (&rest forms)
1211 "Create a temporary buffer, and evaluate FORMS there like `progn'.
1c57d870 1212Use unibyte mode for this."
d37ded9e
SM
1213 `(with-temp-buffer
1214 (mm-disable-multibyte)
1215 ,@forms))
c113de23
GM
1216(put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
1217(put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
1218
23f87bed
MB
1219(defmacro mm-with-multibyte-buffer (&rest forms)
1220 "Create a temporary buffer, and evaluate FORMS there like `progn'.
1221Use multibyte mode for this."
d37ded9e
SM
1222 `(with-temp-buffer
1223 (mm-enable-multibyte)
1224 ,@forms))
23f87bed
MB
1225(put 'mm-with-multibyte-buffer 'lisp-indent-function 0)
1226(put 'mm-with-multibyte-buffer 'edebug-form-spec '(body))
1227
c113de23 1228(defmacro mm-with-unibyte-current-buffer (&rest forms)
56e09c09 1229 "Evaluate FORMS with current buffer temporarily made unibyte.
63220e37 1230Also bind the default-value of `enable-multibyte-characters' to nil.
719120ef
MB
1231Equivalent to `progn' in XEmacs
1232
1233NOTE: Use this macro with caution in multibyte buffers (it is not
1234worth using this macro in unibyte buffers of course). Use of
1235`(set-buffer-multibyte t)', which is run finally, is generally
1236harmful since it is likely to modify existing data in the buffer.
fe62aacc
MB
1237For instance, it converts \"\\300\\255\" into \"\\255\" in
1238Emacs 23 (unicode)."
95fa1ff7
SZ
1239 (let ((multibyte (make-symbol "multibyte"))
1240 (buffer (make-symbol "buffer")))
a1506d29 1241 `(if mm-emacs-mule
719120ef 1242 (let ((,multibyte enable-multibyte-characters)
95fa1ff7 1243 (,buffer (current-buffer)))
1c57d870 1244 (unwind-protect
63220e37 1245 (letf (((default-value 'enable-multibyte-characters) nil))
1c57d870
DL
1246 (set-buffer-multibyte nil)
1247 ,@forms)
95fa1ff7 1248 (set-buffer ,buffer)
1c57d870 1249 (set-buffer-multibyte ,multibyte)))
63220e37 1250 (letf (((default-value 'enable-multibyte-characters) nil))
1c57d870 1251 ,@forms))))
c113de23
GM
1252(put 'mm-with-unibyte-current-buffer 'lisp-indent-function 0)
1253(put 'mm-with-unibyte-current-buffer 'edebug-form-spec '(body))
1254
c113de23 1255(defun mm-find-charset-region (b e)
1c57d870 1256 "Return a list of Emacs charsets in the region B to E."
c113de23
GM
1257 (cond
1258 ((and (mm-multibyte-p)
95fa1ff7 1259 (fboundp 'find-charset-region))
c113de23 1260 ;; Remove composition since the base charsets have been included.
95fa1ff7
SZ
1261 ;; Remove eight-bit-*, treat them as ascii.
1262 (let ((css (find-charset-region b e)))
01c52d31
MB
1263 (dolist (cs
1264 '(composition eight-bit-control eight-bit-graphic control-1)
1265 css)
1266 (setq css (delq cs css)))))
052802c1
DL
1267 (t
1268 ;; We are in a unibyte buffer or XEmacs non-mule, so we futz around a bit.
c113de23
GM
1269 (save-excursion
1270 (save-restriction
1271 (narrow-to-region b e)
1272 (goto-char (point-min))
1273 (skip-chars-forward "\0-\177")
1274 (if (eobp)
1275 '(ascii)
052802c1
DL
1276 (let (charset)
1277 (setq charset
1278 (and (boundp 'current-language-environment)
95fa1ff7
SZ
1279 (car (last (assq 'charset
1280 (assoc current-language-environment
052802c1
DL
1281 language-info-alist))))))
1282 (if (eq charset 'ascii) (setq charset nil))
1283 (or charset
1284 (setq charset
1285 (car (last (assq mail-parse-charset
1286 mm-mime-mule-charset-alist)))))
1287 (list 'ascii (or charset 'latin-iso8859-1)))))))))
c113de23 1288
c113de23
GM
1289(defun mm-auto-mode-alist ()
1290 "Return an `auto-mode-alist' with only the .gz (etc) thingies."
1291 (let ((alist auto-mode-alist)
1292 out)
1293 (while alist
1294 (when (listp (cdar alist))
1295 (push (car alist) out))
1296 (pop alist))
1297 (nreverse out)))
1298
1299(defvar mm-inhibit-file-name-handlers
01c52d31 1300 '(jka-compr-handler image-file-handler epa-file-handler)
c113de23
GM
1301 "A list of handlers doing (un)compression (etc) thingies.")
1302
1303(defun mm-insert-file-contents (filename &optional visit beg end replace
1304 inhibit)
23f87bed 1305 "Like `insert-file-contents', but only reads in the file.
c113de23
GM
1306A buffer may be modified in several ways after reading into the buffer due
1307to advanced Emacs features, such as file-name-handlers, format decoding,
23f87bed 1308`find-file-hooks', etc.
56e09c09 1309If INHIBIT is non-nil, inhibit `mm-inhibit-file-name-handlers'.
c113de23 1310 This function ensures that none of these modifications will take place."
14acf2f5
SM
1311 (letf* ((format-alist nil)
1312 (auto-mode-alist (if inhibit nil (mm-auto-mode-alist)))
1313 ((default-value 'major-mode) 'fundamental-mode)
1314 (enable-local-variables nil)
1315 (after-insert-file-functions nil)
1316 (enable-local-eval nil)
1317 (inhibit-file-name-operation (if inhibit
1318 'insert-file-contents
1319 inhibit-file-name-operation))
1320 (inhibit-file-name-handlers
1321 (if inhibit
1322 (append mm-inhibit-file-name-handlers
1323 inhibit-file-name-handlers)
1324 inhibit-file-name-handlers))
1325 (ffh (if (boundp 'find-file-hook)
1326 'find-file-hook
1327 'find-file-hooks))
1328 (val (symbol-value ffh)))
4a43ee9b
MB
1329 (set ffh nil)
1330 (unwind-protect
1331 (insert-file-contents filename visit beg end replace)
1332 (set ffh val))))
c113de23
GM
1333
1334(defun mm-append-to-file (start end filename &optional codesys inhibit)
1335 "Append the contents of the region to the end of file FILENAME.
1336When called from a function, expects three arguments,
1337START, END and FILENAME. START and END are buffer positions
1338saying what text to write.
1339Optional fourth argument specifies the coding system to use when
1340encoding the file.
23f87bed 1341If INHIBIT is non-nil, inhibit `mm-inhibit-file-name-handlers'."
95fa1ff7
SZ
1342 (let ((coding-system-for-write
1343 (or codesys mm-text-coding-system-for-write
c113de23 1344 mm-text-coding-system))
95fa1ff7 1345 (inhibit-file-name-operation (if inhibit
c113de23
GM
1346 'append-to-file
1347 inhibit-file-name-operation))
1348 (inhibit-file-name-handlers
1349 (if inhibit
95fa1ff7 1350 (append mm-inhibit-file-name-handlers
c113de23
GM
1351 inhibit-file-name-handlers)
1352 inhibit-file-name-handlers)))
23f87bed
MB
1353 (write-region start end filename t 'no-message)
1354 (message "Appended to %s" filename)))
c113de23 1355
95fa1ff7 1356(defun mm-write-region (start end filename &optional append visit lockname
c113de23
GM
1357 coding-system inhibit)
1358
1359 "Like `write-region'.
23f87bed 1360If INHIBIT is non-nil, inhibit `mm-inhibit-file-name-handlers'."
95fa1ff7
SZ
1361 (let ((coding-system-for-write
1362 (or coding-system mm-text-coding-system-for-write
c113de23 1363 mm-text-coding-system))
95fa1ff7 1364 (inhibit-file-name-operation (if inhibit
c113de23
GM
1365 'write-region
1366 inhibit-file-name-operation))
1367 (inhibit-file-name-handlers
1368 (if inhibit
95fa1ff7 1369 (append mm-inhibit-file-name-handlers
c113de23
GM
1370 inhibit-file-name-handlers)
1371 inhibit-file-name-handlers)))
1372 (write-region start end filename append visit lockname)))
1373
b5000590
GM
1374(autoload 'gmm-write-region "gmm-utils")
1375
cf5a5c38
MB
1376;; It is not a MIME function, but some MIME functions use it.
1377(if (and (fboundp 'make-temp-file)
1378 (ignore-errors
1379 (let ((def (symbol-function 'make-temp-file)))
1380 (and (byte-code-function-p def)
1381 (setq def (if (fboundp 'compiled-function-arglist)
1382 ;; XEmacs
1383 (eval (list 'compiled-function-arglist def))
1384 (aref def 0)))
1385 (>= (length def) 4)
1386 (eq (nth 3 def) 'suffix)))))
1387 (defalias 'mm-make-temp-file 'make-temp-file)
01c52d31 1388 ;; Stolen (and modified for XEmacs) from Emacs 22.
cf5a5c38
MB
1389 (defun mm-make-temp-file (prefix &optional dir-flag suffix)
1390 "Create a temporary file.
1391The returned file name (created by appending some random characters at the end
1392of PREFIX, and expanding against `temporary-file-directory' if necessary),
1393is guaranteed to point to a newly created empty file.
1394You can then use `write-region' to write new data into the file.
1395
1396If DIR-FLAG is non-nil, create a new empty directory instead of a file.
1397
1398If SUFFIX is non-nil, add that at the end of the file name."
1399 (let ((umask (default-file-modes))
1400 file)
1401 (unwind-protect
1402 (progn
1403 ;; Create temp files with strict access rights. It's easy to
1404 ;; loosen them later, whereas it's impossible to close the
1405 ;; time-window of loose permissions otherwise.
1406 (set-default-file-modes 448)
1407 (while (condition-case err
1408 (progn
1409 (setq file
1410 (make-temp-name
1411 (expand-file-name
1412 prefix
1413 (if (fboundp 'temp-directory)
1414 ;; XEmacs
1415 (temp-directory)
1416 temporary-file-directory))))
1417 (if suffix
1418 (setq file (concat file suffix)))
1419 (if dir-flag
1420 (make-directory file)
92edaeed
MB
1421 ;; NOTE: This is unsafe if Emacs 20
1422 ;; users and XEmacs users don't use
1423 ;; a secure temp directory.
1424 (gmm-write-region "" nil file nil 'silent
1425 nil 'excl))
cf5a5c38
MB
1426 nil)
1427 (file-already-exists t)
01c52d31
MB
1428 ;; The XEmacs version of `make-directory' issues
1429 ;; `file-error'.
1430 (file-error (or (and (featurep 'xemacs)
cf5a5c38
MB
1431 (file-exists-p file))
1432 (signal (car err) (cdr err)))))
1433 ;; the file was somehow created by someone else between
1434 ;; `make-temp-name' and `write-region', let's try again.
1435 nil)
1436 file)
1437 ;; Reset the umask.
1438 (set-default-file-modes umask)))))
1439
95fa1ff7
SZ
1440(defun mm-image-load-path (&optional package)
1441 (let (dir result)
1442 (dolist (path load-path (nreverse result))
f4dd4ae8
MB
1443 (when (and path
1444 (file-directory-p
1445 (setq dir (concat (file-name-directory
1446 (directory-file-name path))
d31fa104 1447 "etc/images/" (or package "gnus/")))))
f4dd4ae8 1448 (push dir result))
95fa1ff7
SZ
1449 (push path result))))
1450
23f87bed
MB
1451;; Fixme: This doesn't look useful where it's used.
1452(if (fboundp 'detect-coding-region)
1453 (defun mm-detect-coding-region (start end)
1454 "Like `detect-coding-region' except returning the best one."
1455 (let ((coding-systems
9d9b0de9 1456 (detect-coding-region start end)))
23f87bed
MB
1457 (or (car-safe coding-systems)
1458 coding-systems)))
1459 (defun mm-detect-coding-region (start end)
1460 (let ((point (point)))
1461 (goto-char start)
1462 (skip-chars-forward "\0-\177" end)
1463 (prog1
1464 (if (eq (point) end) 'ascii (mm-guess-charset))
1465 (goto-char point)))))
1466
b5000590
GM
1467(declare-function mm-detect-coding-region "mm-util" (start end))
1468
23f87bed
MB
1469(if (fboundp 'coding-system-get)
1470 (defun mm-detect-mime-charset-region (start end)
1471 "Detect MIME charset of the text in the region between START and END."
1472 (let ((cs (mm-detect-coding-region start end)))
bd29ba20
RS
1473 (or (coding-system-get cs :mime-charset)
1474 (coding-system-get cs 'mime-charset))))
23f87bed
MB
1475 (defun mm-detect-mime-charset-region (start end)
1476 "Detect MIME charset of the text in the region between START and END."
1477 (let ((cs (mm-detect-coding-region start end)))
1478 cs)))
1479
01c52d31
MB
1480(eval-when-compile
1481 (unless (fboundp 'coding-system-to-mime-charset)
1482 (defalias 'coding-system-to-mime-charset 'ignore)))
1483
1484(defun mm-coding-system-to-mime-charset (coding-system)
1485 "Return the MIME charset corresponding to CODING-SYSTEM.
1486To make this function work with XEmacs, the APEL package is required."
1487 (when coding-system
1488 (or (and (fboundp 'coding-system-get)
1489 (or (coding-system-get coding-system :mime-charset)
1490 (coding-system-get coding-system 'mime-charset)))
1491 (and (featurep 'xemacs)
1492 (or (and (fboundp 'coding-system-to-mime-charset)
1493 (not (eq (symbol-function 'coding-system-to-mime-charset)
1494 'ignore)))
1495 (and (condition-case nil
1496 (require 'mcharset)
1497 (error nil))
1498 (fboundp 'coding-system-to-mime-charset)))
1499 (coding-system-to-mime-charset coding-system)))))
1500
1501(eval-when-compile
1502 (require 'jka-compr))
1503
1504(defun mm-decompress-buffer (filename &optional inplace force)
1505 "Decompress buffer's contents, depending on jka-compr.
1506Only when FORCE is t or `auto-compression-mode' is enabled and FILENAME
1507agrees with `jka-compr-compression-info-list', decompression is done.
1508Signal an error if FORCE is neither nil nor t and compressed data are
1509not decompressed because `auto-compression-mode' is disabled.
1510If INPLACE is nil, return decompressed data or nil without modifying
1511the buffer. Otherwise, replace the buffer's contents with the
1512decompressed data. The buffer's multibyteness must be turned off."
1513 (when (and filename
1514 (if force
1515 (prog1 t (require 'jka-compr))
1516 (and (fboundp 'jka-compr-installed-p)
1517 (jka-compr-installed-p))))
1518 (let ((info (jka-compr-get-compression-info filename)))
1519 (when info
1520 (unless (or (memq force (list nil t))
1521 (jka-compr-installed-p))
1522 (error ""))
1523 (let ((prog (jka-compr-info-uncompress-program info))
1524 (args (jka-compr-info-uncompress-args info))
1525 (msg (format "%s %s..."
1526 (jka-compr-info-uncompress-message info)
1527 filename))
1528 (err-file (jka-compr-make-temp-name))
1529 (cur (current-buffer))
1530 (coding-system-for-read mm-binary-coding-system)
1531 (coding-system-for-write mm-binary-coding-system)
1532 retval err-msg)
1533 (message "%s" msg)
1534 (mm-with-unibyte-buffer
1535 (insert-buffer-substring cur)
1536 (condition-case err
1537 (progn
1538 (unless (memq (apply 'call-process-region
1539 (point-min) (point-max)
1540 prog t (list t err-file) nil args)
1541 jka-compr-acceptable-retval-list)
1542 (erase-buffer)
1543 (insert (mapconcat
1544 'identity
1545 (delete "" (split-string
1546 (prog2
1547 (insert-file-contents err-file)
1548 (buffer-string)
1549 (erase-buffer))))
1550 " ")
1551 "\n")
1552 (setq err-msg
1553 (format "Error while executing \"%s %s < %s\""
1554 prog (mapconcat 'identity args " ")
1555 filename)))
1556 (setq retval (buffer-string)))
1557 (error
1558 (setq err-msg (error-message-string err)))))
1559 (when (file-exists-p err-file)
1560 (ignore-errors (jka-compr-delete-temp-file err-file)))
1561 (when inplace
1562 (unless err-msg
1563 (delete-region (point-min) (point-max))
1564 (insert retval))
1565 (setq retval nil))
1566 (message "%s" (or err-msg (concat msg "done")))
1567 retval)))))
1568
1569(eval-when-compile
1570 (unless (fboundp 'coding-system-name)
1571 (defalias 'coding-system-name 'ignore))
1572 (unless (fboundp 'find-file-coding-system-for-read-from-filename)
1573 (defalias 'find-file-coding-system-for-read-from-filename 'ignore))
1574 (unless (fboundp 'find-operation-coding-system)
1575 (defalias 'find-operation-coding-system 'ignore)))
1576
1577(defun mm-find-buffer-file-coding-system (&optional filename)
1578 "Find coding system used to decode the contents of the current buffer.
1579This function looks for the coding system magic cookie or examines the
1580coding system specified by `file-coding-system-alist' being associated
1581with FILENAME which defaults to `buffer-file-name'. Data compressed by
1582gzip, bzip2, etc. are allowed."
1583 (unless filename
1584 (setq filename buffer-file-name))
1585 (save-excursion
1586 (let ((decomp (unless ;; No worth to examine charset of tar files.
1587 (and filename
1588 (string-match
1589 "\\.\\(?:tar\\.[^.]+\\|tbz\\|tgz\\)\\'"
1590 filename))
1591 (mm-decompress-buffer filename nil t))))
1592 (when decomp
63220e37
GM
1593 (set-buffer (letf (((default-value 'enable-multibyte-characters) nil))
1594 (generate-new-buffer " *temp*")))
01c52d31
MB
1595 (insert decomp)
1596 (setq filename (file-name-sans-extension filename)))
1597 (goto-char (point-min))
1598 (prog1
1599 (cond
1600 ((boundp 'set-auto-coding-function) ;; Emacs
1601 (if filename
1602 (or (funcall (symbol-value 'set-auto-coding-function)
1603 filename (- (point-max) (point-min)))
1604 (car (find-operation-coding-system 'insert-file-contents
1605 filename)))
1606 (let (auto-coding-alist)
1607 (condition-case nil
1608 (funcall (symbol-value 'set-auto-coding-function)
1609 nil (- (point-max) (point-min)))
1610 (error nil)))))
9efa445f 1611 ((and (featurep 'xemacs) (featurep 'file-coding)) ;; XEmacs
01c52d31
MB
1612 (let ((case-fold-search t)
1613 (end (point-at-eol))
1614 codesys start)
1615 (or
1616 (and (re-search-forward "-\\*-+[\t ]*" end t)
1617 (progn
1618 (setq start (match-end 0))
1619 (re-search-forward "[\t ]*-+\\*-" end t))
1620 (progn
1621 (setq end (match-beginning 0))
1622 (goto-char start)
1623 (or (looking-at "coding:[\t ]*\\([^\t ;]+\\)")
1624 (re-search-forward
1625 "[\t ;]+coding:[\t ]*\\([^\t ;]+\\)"
1626 end t)))
1627 (find-coding-system (setq codesys
1628 (intern (match-string 1))))
1629 codesys)
1630 (and (re-search-forward "^[\t ]*;+[\t ]*Local[\t ]+Variables:"
1631 nil t)
1632 (progn
1633 (setq start (match-end 0))
1634 (re-search-forward "^[\t ]*;+[\t ]*End:" nil t))
1635 (progn
1636 (setq end (match-beginning 0))
1637 (goto-char start)
1638 (re-search-forward
1639 "^[\t ]*;+[\t ]*coding:[\t ]*\\([^\t\n\r ]+\\)"
1640 end t))
1641 (find-coding-system (setq codesys
1642 (intern (match-string 1))))
1643 codesys)
1644 (and (progn
1645 (goto-char (point-min))
1646 (setq case-fold-search nil)
1647 (re-search-forward "^;;;coding system: "
1648 ;;(+ (point-min) 3000) t))
1649 nil t))
1650 (looking-at "[^\t\n\r ]+")
1651 (find-coding-system
1652 (setq codesys (intern (match-string 0))))
1653 codesys)
1654 (and filename
1655 (setq codesys
1656 (find-file-coding-system-for-read-from-filename
1657 filename))
1658 (coding-system-name (coding-system-base codesys)))))))
1659 (when decomp
1660 (kill-buffer (current-buffer)))))))
3efe5554 1661
c113de23
GM
1662(provide 'mm-util)
1663
9d9b0de9 1664;; arch-tag: 94dc5388-825d-4fd1-bfa5-2100aa351238
c113de23 1665;;; mm-util.el ends here